Last sentence I have definitely experienced first hand. I donated blood then went walking to the store on a hot day (about 1 mile round trip) and almost passed out. So yeah don’t do anything that increases the dehydration after blood donation.

My family sometimes uses bleach to clean and we learned very quickly not to mix it with anything. I once convinced my sister to mix it with vinegar and after expressing skepticism she finally did it. Bad idea, we had to open all the windows but it sure did leave the floors clean.

Vinegar usually works fine and can be a great replacement for bleach.