Try to keep the surface of your furniture dust-free. Weekly dusting is 90% of the maintenance. Dust, or micro-pollution, can mix with skin dirt and/or perspiration. This combination can cause annoying black stains. 

Feed leather every six months with the products from the regular maintenance set. Nourishment is extremely important and the half-yearly maintenance is unfortunately sometimes skipped. Dried-out leather will absorb liquids much quicker, making it more difficult to remove stains with liquids.

For liquid stains, try to remove the liquid as quickly as possible. Try to dab as little as possible on the stain. Take some (uncoloured) kitchen paper and use it to soak up the liquid. This is easiest if you hold the tip of the paper in the liquid.

Remove solid stains as far as possible with a (clean) spoon. 

Try to resist the temptation to scrub, rub or put pressure on the material in any way. Chances are you will see it permanently. 

Do not use any household, garden and kitchen detergents. They often contain solvents. 

Always clean an entire property (such as a seat/back) and not just the stain.

Always work a stain from the outside in and apply as little pressure as possible.

Let the foam do the work. Apply the foam from the cleaner to the stain and allow it to soak in briefly (do not allow it to dry). Then wipe off the foam with a slightly damp cloth. See rule 10.

Not all tap water in the Netherlands has the same water hardness. Therefore, always use distilled water to prevent limescale after cleaning.