what kind of solution can I use to slightly stain (and darken) a small piece of plastic?
468375
Two solutions that you will find in any home, tea and coffee. They should do the job nicely.\nThe longer you leave it in the fluid, the darker it will become, so check it often.
548023
let me tickleyou_there, alternatively try vinegar and brown paper
11100
Use a black sharpie...works like a charm!
1163788
mix the two, if that doesn't work try using a paint scraper to scrape the paint off manually.
740416
Your question is incomplete.  What type of stains are you talking about?  Looking at the properties of the stain and you may find the answer you need.
61841
Have you tried bleach?\n\nI found a message board post where they talk about using a bleach pen along with a quick rinse, which seemed to be successful.\n\n(I would think you could use bleach for colors if you need in place of normal bleach).
314012
Use Acetone\n\n Nail Polish Remover
361181
try the mr. clean eraser.  it is very hard to get the color off, u may be stuck with it
426471
Just take an old piece of a tshirt. Put alchol on it and rub it over the rollers etc. Anything u can reach. Believe it will be black until u get all that crap off
864505
Windex works, so does rubbing alcohol. Use paper towel.
977636
Vegetable oil and isopropyl alcohol.  Put a little food coloring in to help differentiate between the two (it will only dissolve in the alcohol)
584782
Make it a small float and use tissue paper.
910465
bleach if the cloths are white. but i guess if its like mold you could leave it out to dry in the sun.
533393
Try Oxi Clean. Works prety good for my hubby's grease stains.
1017020
use a screen cleaner liquid solution
957
make a small hole in piece of paper with a needle, reflect the light that goes thru the hole onto some shaded surface
37825
Use hydrogen peroxide. It will bubble the blood out. Soak it then rinse it. Blot it dry lightly then repeat til the stain is mostly gone then wash it in cold water with regular detergent.