Dont wash them.
I washed mine with spray type carpet cleaner,afew days later my wife asked where I got the gray floor matts.Well they used to match pretty good. eek
Wonder what happened,didnt notice any blue on the rag.Butnthey are surely a gray shade now.I confused bet 5 shades lighter then before.

Howard
1998 Silverfrost SVT #1612
June mods:
17" ADR RS Limited Limix Wheels
with 215/45/17 Yokohama AVS Sports