Caring for faux leather boots: salt, water and cracking

A synthetic boot does not need feeding, polishing or conditioning, which means caring for one is quicker than caring for leather and almost entirely about two things: getting salt and water off it promptly, and not letting it dry in the wrong place. Nearly every faux leather boot that dies young dies of one of three causes, and all three are avoidable without buying a single product.

What you are actually cleaning

Faux leather, often labelled PU or vegan leather, is a thin polyurethane film coated onto a backing cloth. The film is the waterproof part and the cloth is the strong part. Everything about caring for it follows from the fact that the surface you can see is a plastic skin a fraction of a millimetre thick.

That film is reasonably water resistant and almost entirely stain resistant, which is the good news. What is not water resistant is everything around it: the stitch holes, the seams, the join where the upper meets the sole, and the lining and insole inside, which absorb water readily and dry slowly.

So the surface rarely needs much work. The water that gets past the surface is the thing to manage.

The routine wipe

A cloth wrung out in warm water with one drop of washing-up liquid, then a second cloth wrung out in clean water, then dry with a soft cloth. That is it, and it handles mud, street grime and most spills. Do it the evening you get home rather than the following weekend, because dirt sitting in a crease works into the film.

Test anything new on a hidden area such as the inside of the shaft or the tongue. Some coated finishes release a little pigment, and it is better to discover that on a square centimetre nobody sees.

Clean the hardware while you are there. Eyelets, hooks, buckles and zip teeth collect grit and salt, and a zip that gets gritty wears out long before the boot does. Wipe them, dry them, and if a zip is dragging run a candle stub or a dry lubricant down the closed teeth rather than oiling it.

Salt, which is the real enemy

Road and pavement salt leaves a white crust that is alkaline and hygroscopic, meaning it pulls moisture out of the air and holds it against the boot. Left on, it stiffens the material, stains visibly on dark finishes, and dries the surface film, which brings forward the day it starts to crack.

Get it off the same day. Water alone will shift fresh salt. For a dried crust, a cloth damped with a weak solution of white vinegar in water, roughly one part vinegar to three or four parts water, neutralises the alkalinity and lifts the deposit. Follow with a clean damp cloth and then a dry one, because you do not want vinegar left sitting on the material either.

Pay particular attention to the welt area where the upper meets the sole, which is where salt collects and where the adhesive bond lives. Salt sitting in that join through a whole winter is one of the commonest ways a cemented sole starts to open at the toe.

Drying, where most damage happens

Never put a wet boot near a radiator, a fire, a hot pipe or a hairdryer. Heat makes polyurethane brittle, can bubble or delaminate the film, and softens the adhesive holding the sole on. The boot will look fine when it comes out and will crack at the vamp a month later.

Instead: pull the insoles out, loosen the laces fully, open the boot up, and stuff the inside with crumpled paper. Change the paper after an hour or two while it is still doing something. Leave it at room temperature with air moving, which usually means a day for a soaked boot and sometimes two. Boot dryers that blow unheated air are genuinely useful if you get wet feet regularly.

Stuffing does a second job: it holds the shaft and the toe box in shape while they dry, so the creases do not set deeper. Shoe trees or even a rolled magazine in the shaft are better than nothing. This is also the right way to store the boots between seasons, upright and stuffed rather than folded over in a heap, because a crease held for four months becomes a crack.

Cracking, and what you can and cannot do about it

Polyurethane breaks down slowly on contact with water, including water vapour in ordinary air, and it gets less flexible as it does. The places that go first are the flex points: the vamp crease over the toes, the back of the heel, and anywhere a strap folds. Once the film has lost its flexibility, every step is splitting it a little further.

You can slow it and you cannot stop it. Keeping the boot clean, keeping it out of prolonged heat and damp, never storing it wet, and keeping the creases unfolded in storage all buy you time. Nothing applied to the surface reverses it, because the chemistry is in the film rather than on it.

Specifically, do not use leather conditioner, mink oil, dubbin or saddle soap. There is nothing in a plastic film to feed, so they sit on top, pick up dust and leave the boot slightly tacky. Products sold for vinyl or synthetic uppers are mostly water, a mild surfactant and a silicone: they improve how it looks and do nothing about the underlying breakdown. Once the film is flaking, no repair lasts. Flexible vinyl filler will hide a chip and will not match an embossed grain.

Things that will finish a boot off early

Acetone, nail polish remover, white spirit, alcohol wipes, hand gel and bleach all attack the film rather than the dirt on it. A washing machine destroys the sole bond and the internal stiffeners. A shoe polish meant for leather will not take, and a wax polish on a matte synthetic leaves a patchy sheen you cannot remove.

Direct heat has already been mentioned and is worth mentioning twice, because it is the single most common way people ruin synthetic footwear. The same rule applies to a synthetic coat: if you have something like The Belted Trench, it wants the same treatment, which is a damp cloth and room temperature air.

A last honest point. We list what our suppliers tell us, and if you want to know what a specific pair is actually made of before you buy, ask us and we will go and read the spec sheet rather than guess from a photograph. That applies to The Platform Boot and to The Work Boot equally, and since we take no returns on footwear, asking first costs you an email and saves you the price of the boots.

Questions people actually ask

How do you get salt stains off faux leather boots?

Wipe them with a cloth damped in a weak solution of white vinegar in water, about one part vinegar to three or four parts water, then go over them with a clean damp cloth and dry them. The vinegar neutralises the alkaline salt. Do it the same day, because salt holds moisture against the material.

Can you waterproof faux leather boots?

The surface film is already water resistant, so sprays add little there. The water that causes problems gets in through seams, stitch holes and the sole join, and a spray will not seal those. Prompt cleaning and slow, cool drying matter far more.

How do you stop faux leather boots from cracking?

Keep them clean, never dry them near heat, never store them wet, and stuff them so the flex creases are not held folded. Nothing applied to the surface reverses the breakdown, because it happens inside the polyurethane film rather than on it.