J.K.
Removing pen - you can do the same with straight rubbing alcohol, without having to then wash off the sticky hairspray residue.
I use a 50/50 solution of white vinegar and blue Dawn dish soap in a spray bottle for cleaning many things. It dissolves soap scum in the shower, clears away dried up toothpaste in the sink, removes stains from laundry, cuts through grease on the stove or in the microwave. (Some online instructions say to heat the vinegar. That is completely unnecessary.)
Instead of buying refills for foaming dishsoap, I use regular dish soap in a 1/3 to 2/3 water. Works great for washing hands in the kitchen too, particularly if you're making something oily/greasy. Put the water in first, then the soap, to avoid making foam while filling. Put the top on then tilt back & forth gently to mix.