Tahaarat

Mango string getting stuck between one's teeth

Q: If a mango string is stuck in my teeth, I did my best to clean my teeth before making ghusl mindful that all mango strings are taken out, after ghusl I read salaah and quraan. The next morning I ate thereafter I cleaned my teeth again and I found a small single mango string from my teeth. Is the ghusl, salaah and reading of quraan valid? The mango string is as thin as hair.

Seeing white spots on one's clothes

Q: I have been having little doubts about wet dream. I woke this morning and I got changed and went with my day. Didn't notice any wetness or anything, but when I got home in afternoon to pray I got little doubts so I went to check the garment that slept in. When I checked, the garment had very little white dry patches. Since I saw these patches I got more waswasas. Also I put this garment with my clean clothes. I was wondering is this garment impure? Will my prayer be invalid? Is this just waswasas? If it is not waswasas, will the other clothes become impure as well?