Hi Pekkala I have these make of carpet tiles - got spills on some of them, cleaning products don't work and seem to just make more mess! Found out the best way is to pull the dirty tile up wash under hot water in kitchen sink and scrub with a little washing up liquid (you can see all the gunk rinsing out).
Wash all detergent out and let dry naturally (not with heat)
DON'T USE BLEACH!! you'll just end up ruining it by taking out the colour