I would recommend doing it outside as it stinks and the rust from the steel wool will stain concrete so do it in a shop or over the road. DIY Vintage Wood Stain look. (How to age new wood). Good for all things wood!
Homemade liquid laundry or powder Powdered Laundry Soap: 2 cups finely grated soap (Ivory, Fels Naptha, Zote, homemade, or a combination) 1 cup borax 1 cup washing soda Mix and store in a coffee can or what have you. Use T per load.
If you swish with hydrogen peroxide everyday you will have the same results plus excellent gum tissue! Recommend swishing with peroxide for minutes morning and night. It kills bacteria that causes decay, gingivitis, periodontal disease. Worth a shot!