Ultima Paint Guard Wash -DILUTION QUESTION

-Surface Care Specialist
 
The PFC website notes that when using Ultima Paint Guard wash, a user should add 3/4 to 1 oz to 3 gallons of water.

Well, What's the recommended dilution ratio?

Is it safe to say 1:500? We state 1 ounce to be used between 3 to 5 gallon of clean water on the directions because Paint Guard Wash is a very concentrated formula.  If car is very dirty then only put 3 gallons of water in bucket and if the car is very dirty up to 5 gallon of water.  This is what we feel was proper amount to use. 

Using more will not harm the vehicle, but it will be wasted.