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If you have hot water then I personally wouldn't use any degreaser.I did a test on dirty PVC gutters to see what degreaser was the best to use. In the end they were all very similar but what made a difference was the temperature of the water I mixed it with. The higher the temperature the easier the dirt came off. If you can afford a hot system then go for it because it wont disappoint especially in the winter months. :1f609: