How to clean your tennis court
High-pressure cleaning is not suitable for your tennis, basketball or netball court, as it will damage the delicate painted surface – many pressure washers will use up to 4000 psi (pounds per square inch) of pressure – while this is good for concrete cleaning, it can be very bad for tennis courts as it just tears the paint away (and maybe the mould too). While the court will look great, especially when wet, the pressure has torn off a lot of the surface paint, and because the mould hasn’t been killed, it just grows back. If your court is covered in clean stripes a year or two after cleaning it is because the mould wasn’t killed last time and only high-pressure water was used (see my photos below).
To successfully clean a tennis court all the mould needs to be killed, and all the dirt needs to be lifted with a strong mould killer & detergent, then it all needs to be washed away with just enough pressure to get into the rough surface, but not tear the paint away. The final rinse is very important and can not be rushed as all the fine particles of dirt and any detergent residue must be washed away, this usually requires two attempts.