I'd be wary of getting a power washer up there, looks like you could force water in through the gaps between the tiles
power washer
Hah yeah. If the question involves 'power washer' the answer is almost always 'No'.
Unless it's 'should I get rid of my power washer?'.
@Howard started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I'd be wary of getting a power washer up there, looks like you could force water in through the gaps between the tiles