On Sunday, 5 August 2018 08:13:11 UTC+1, Brian Gaff wrote:
Many years ago, I heard this terrible loud hissing and gurgling from a few
houses away. It was, apparently somebody who took their old trusty cooker
outside and powerwashed it.

That's okay with gas cookers, not so wise for electric ones in case the water gets in the electrics, and definately not recommended for Agas as they're filled with insulation which would get waterlogged.

Owain