I bought some duragloss shampoo last week and just tried to use it today. I used 3 capfulls in a 5 gallon bucket and it sudsed in the bucket but when I got my grout sponge in it and put it on the car there were absolutely no suds. It was just water. I tried using a jet of water to get some more but once the sponge went it and came out it was still water. I emptied that out and got some nxt wash and it sudsed just fine. Any ideas? Did I get a bad bottle maybe?