How to Clean and Seal Patio Limestone Ocean Kota Blue?

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Hi
Apologies if this has already been asked.
We laid down some Ocean Kota Blue limestone and didn't realise we should seal it (I know school boy error).
It has started to mark, strange colours and the pointing has started to get moss.

I have read about using a pressure washer, but not blasting the pointing.

After some real life advice of what cleans it up best and what to seal it with afterwards so it looks nice, natural but also lasts (I've already marked it cleaning my mtb :( )

Thanks in advance
 

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