Light coloured washing gets dark stains during

dont let softner touch cloths wash cold

I had a similar problem. In my case it was because I always used a low temperature '30' wash. There was a build up of gunge in the folds of the rubber door seal. I wiped this off and then put towels through on a high temperature wash which cured the problem. I repeat the high temperature wash occasionally and the problem has not reappeared. Hope the answer is a simple as this.