Doug
+1 for Bilgex.
You may like to read PBO’s review at https://www.pbo.co.uk/gear/best-bilge-cleaners-50797
Another thought. I strongly recommend the use of an ‘oil mat’ under the engine (ideally in the drip tray if you have one).
Not the ‘socks’ which I think are less useful.
You can get them all over the place e.g. in bulk or through chandlers and marine suppliers such as ASAP supplies .
They are a bit of a ‘green’ compromise – they are made of plastic.
Cheers
Nick