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I'm not sure that brick buildings in London get pressure washed very often - if ever.

Pressure washing a house is very American, and any building inspector, residential or commercial, will suggest that it is something that shouldn’t be done.

I would like to put $73 on "never" please

This article from last years agrees that the frequency of cleaning UK city buildings is quite low.

https://news.ycombinator.com/item?id=17883481

https://www.manchestereveningnews.co.uk/incoming/gallery/bla...

I also stumbled upon this discussion on cleaning London buildings in a Lords sitting in 1964 which was quite fun to read.

https://api.parliament.uk/historic-hansard/lords/1964/nov/12...

I saw that gallery of Manchester the other day, that's pretty amazing. But yeah, brick / stone walls shouldn't be pressure washed too often; if they're historical, they should be restored and / or carefully cleaned instead.

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