Would you recommend cleaning a roof and what the best to use

Yes best way to clean a roof is to use a wire brush because power washing roof might cause leaks.

Yes don’t have your roof power washed it can make it Porous Scrape the moss off or use wire brush

Use a hard broom is best, once you've clean the roof down spay the roof with a moss killer job done

The best option is to scrape the moss off because jet washing can cause the tiles to get pourist and sometimes ruin the look of your house as it sometimes takes the top layer of colour off your tiles

I recommend using a wire brush or a hard broom but make sure you brush down so not to move tiles or damage the roof then you can use a moss killer etc