Mold stains and toilet cleaning tips

Ok, I have 2 questions:

Firstly, I have mold stains on a few clothing items (my dad had the brilliant idea to throw a wet face washer into the white washing basket. A couple of days later and 2 T-shirts have mold stains on them that I can't get out. I tried Napi San, Preen Oxy Action Stain Remover (the 2 phase stuff) and even bleach, to no avail. I also have a couple of bibs that have mold stains that have undergone the same treatment and an orange skirt that I didn't try bleach on for obvious reasons.

Secondly, my toilet has a build-up around the rim. I don't know what it is called in English (it's my second language), but it is a mixture of calcium & lime build-up from the water, together with urine. In Germany, they have special cleaners for that, but I have no idea what to look for here. Regular loo cleaner doesn't do the trick. Will I need to file it off? I bought some CLR, but am not exactly sure how to use it or if it's even suitable. Anyone got any good techniques?

Thanks, Saša