Green walls!

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Just bought a lovely cottage with a nice barn attached. Some of the interior walls are a bit 'green'!

Can I just power wash this off? Anything to be aware of?

Cheers.
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Get some BAC50 Benzalkonium Chloride, works really well to kill moss and algae and inhibit regrowth.
 
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A commercial product called "wet and forget" can be used. They sell it mail-order. There is usually a Special Offer on.

power washing is likely to dislodge old mortar and smaller stones.
 
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@JohnD tells people to use Wet & Forget which may be, but often isn't, good advice. Wet & Forget & Patio Magic are commercial products which have Benzalkonium Chloride as the active ingredient at c. 5-10% level and you dilute them down to the 1-2% level.

If you are absolutely sure that you will only ever need to use the stuff once then Wet & Forget or Patio Magic will do. If not then follow the advice from @jbonevia and get some BAC50, Benzalkonium Chloride at 50%. That will keep you going for many years.
 
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