I have been using this product for a long time and have noticed a noticeable decrease in the product's ability to clean carburetor parts. The instructions on the jar show that soaking for 15-30 minutes does absolutely nothing. Longer soaks (overnight) also yield less brilliant results—essentially an overpriced degreaser. The quality of the gallon sized container has also deteriorated - it's half the weight of other gallon sized containers I use (car paints), tends to bend/dent, and mine arrived with the lid and sides dented in multiple places - still usable must question the integrity of the container, if it rusts it is likely to leak on the shelf. Traditional degreasers (at 1/3 the cost) are cheaper. This product is overpriced for what it offers.