That's what immigrant car washes are for :)
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Yeah you should use liquid detergent not tablets or powder.
The few times I've oiled a filter, I used extra virgin coconut oil and blew it through with a air line.
.....and how many 'extra virgins' are there in Poole ?
Too be honest, It's not necessary to oil a cotton filter. I know the manufacturers say you should, but the way I see it is this....
A cotton filter, when clean, filters down to approx 0.05 microns. That's a hell of a lot more than an OE paper filter yet no where near as much as stainless steel race filter.
To put that into perspective....0.05 microns is 0.00005 mm!!! That's so small you can't see it with the naked eye. A particle of dirt that small is not going to damage an engine.
I do not see any need to then spray a load of filter oil all over the filter. All it does is attract dirt that cannot pass through the filter anyway and long term, will knacker your MAF! as well as clog up the filter and ruin it.
I leave mine totally dry and wash it in warm soapy water once a year, rinse then air dry for 24hrs.
The exact reason I don't oil filters any more.