1. It depends entirely on the fabric and what it’s dyed with. There are dark clothes that don’t stain, even if not washed at all. But also there are dark clothes that do stain, even after having been washed many times. Just be careful, check for stains every 15 minutes. Take off the clothes if there is the beginning of a stain and it will disappear. The heavier the stain, the longer it takes to disappear.
2. I have had very good results using “Retayne” but it’s quite important to follow the directions exactly and thereafter never wash the garment in hot water.
Also, quality clothing is best. The dyes used in cheap clothing are notorious for bleeding. I play it safe and use body stockings as a block whenever I can as well.
Learn TPE-Safe Stain Remover from here!