done lots.
as glynn said apply solutions 2 ,aggitate then i use my cfr hand tool open the vac slots & clean.
some of this fabric can peel of the backing if to much aggitation is used,through genral wear,using water based cleaners,using solvent based cleaners.this sounds as if they are a bit of a problem, but i have cleaned hundreds ,test them first,
ps
when they have been cleaned using a hand tool they will feel like a wet fish,this is only surface dampness & will dry quickly.
DO NOT OVER AGGITATE
TOWEL AFTER CLEANING
Lee Gundry