I refill a spray bottle and use this to clean just about everything. I figured out my cost today and for a 32 oz spray bottle it cost me 0.27 cents. With the tea tree oil being the most expensive ingredient. I have also been known to spray out my kitchen sink with just plain vinegar, which is by itself a strong disinfectant.
All Purpose Disinfectant and Cleanser
2 tsp borax
1/4 cup vinegar
4 cups hot water
12 drops tea tree oil
1/4 tsp liquid soap
Mix all ingredients (except tea tree oil) in spray bottle and shake. After mixture has cooled, add tea tree oil. Shake before each use.
Homemade Hippie Orange Cleaner