Laundry detergent testing

[Anonymous No.11486119]

I work at a laundromat. And I wash 7.53 billion garments every year. 5 million of those garments are ruined by serious color degredation every year. I just randomly throw in a bunch of chemicals in every wash. Recently I've started throwing a new chemical into the mix that might cause color degredation. Would it be scientifically sound to test the ruined garments out of the regular laundry flow for the chemical after they've been ruined? That's what I've been doing and so far it seems to be present in 2-4% of ruined garments. Would it be a sound scientific conclusion based on the methodology to say that there is a 2-4% chance that this chemical will cause color degredation or is there a serious flaw on the reasoning and methodology behind that conclusion?