How you clean a poly tarp may vary depending on the make and model.
One method is shown below:
Step 1 – Mix cleaner
Mix some detergent (such as washing-up liquid) with hot water.
Step 2 – Wash tarpaulin
Use this mixture to wash the tarpaulin.
Step 3 – Rinse with water
Clean the tarpaulin off with water.
Please note
Some users simply clean their plastic tarpaulins with water from a hose, scrubbing off more difficult patches with a wet cloth.
However you decide to clean yours, it is important not to put a canvas tarpaulin into permanent storage whilst it is wet, as doing this may lead to mould forming.