i used mineral spirits that you can probly find at hardware stores or maybe even like walmart idk and then i used a contact case (i dont use that case anymore obviously)
hydrogen peroxide is H2O2 and can very easily lose one O atom and become H2O which is water if you dont know and cleaning with water will just rust it. if you did use the peroxide you would need to do it in a dark area or a thick non-transparent bottle of some kind. lil science lessen there =) just lettin you know
hard yes but theyre not really very thick so i mean its better than a cheap water bottle but you would want somethin thicker or just somethin really dark and kinda thick. or mineral spirits is the easiest to use. and you can burn it when your done =)