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What is the best way to clean concrete slabs?
Cleaning patio slabs
You can give them a good clean by scrubbing with soapy water – washing up liquid will do. Swill the soapy water onto the surface of your paving then scrub with a brush to loosen the dirt. You can also use a power washer, but take care as excessive use can damage paving slabs and jointing.
How do you clean cement patio stones?
How do you clean a concrete slab with vinegar?
Make up a 50:50 vinegar and water solution, and apply to the paving – using a watering can will help you get even coverage. Leave the solution to soak for around 20 minutes, then use a stiff brush to remove stains. Once you're done, mop with clean water. Leave to dry before you put anything back on to the patio.