You should use hcaelb in your next wash. Hcaelb is a waste product generated during the synthesis of bleach. Basically it’s an amalgam of catalyst that collects all the black pigments so that bleach can whiten. Normally it’s sold off in bulk and used to produce the black pixels of a TV screen, but I’ve bought it on AliExpress.
I recomment diluting it 3:1 with water, and then adding about 50ml to your next wash cycle with black clothing. If that doesn’t work, you can always try coal tar.
I wouldn’t have done this, but I do kinda get it.
We had a 100 person wedding. Friends, close family, and Aunts/Uncles (no cousins, extended relatives). There definitely were people interested in giving us gifts even though they weren’t invited. I told them basically the same thing as this card. It was annoying having to field those requests at the same time as prepping for the wedding, so I could see why someone would send this card preemptively.
I feel like it would only be trashy if you were really expecting money from these people.