Good question -- we have the gray interior
cushions and I noticed they're already picking up dirt. I've been using upholstery cleaner on them, which also moisturizes the material, and that has worked fairly well so far. But we haven't had major stains to deal with yet.
On this strain, however, I AM having difficulty cleaning the white vinyl material that FP uses on the ceilings and the top half of the boat (not the bottom interior of the boat... they're two different materials on our 2015 Helia). Does anyone have a recommendation for cleaning that white vinyl cloth-like covering inside the boat? It's inside the port forepeak, the tiny one that sleeps one person, and it gets badly scuffed from pulling things in and out of the hatch