Best registry cleaner. Our testing has shown that RegSweep is a reliable, fast, and consistent best registry Cleaner software. It does perform in the way that the product's website says it will, and in our test, the utility scan did complete its test in under two minutes. It found an amazing number of errors (319), over and above our resident registry cleaner. As a registry cleaner repair tool, this utility certainly does rate among the most thorough of programs on the market.