Fill a spray bottle with a 50/50 solution of bleach and water. Shake the bottle to mix the solution.
Spray the solution over the tile grout. Allow the solution to sit for a few minutes so that the bleach can absorb into the grout.
Rub a hard-bristled toothbrush over the grout lines to remove the hairspray from the surface of the grout.
Wipe down the grout lines with a clean sponge and warm, soapy water. Apply some elbow grease, while wiping down the grout, to completely remove the hairspray and bleach solution residue.