I have used a cleaning rod (brass - not steel or alloy) - you know the length of the barrel and tap and mark it on the rod - you need to watch you don't push beyond ( I bind some electricians tape around the rod at the correct distance to prevent it pushing into the muzzle - but remember, the muzzle on the later Airsporters are bigger than .22!) and into the transfer port as anything will be pushed inside.
Open the tap after you have cleaned the barrel a few times with new lint on the rod until you are happy it’s clear - clean inside the tap with a cotton bud. (cheap as chips)
Finish off with felt cleaning pellets - shooting them down the barrel into a safe stop.
Well that's what I have done and it seems to work for me.
Others may suggest a different or better way.
I prefer to remove the loading tap assembly as it makes it all so much easier - just be careful you don’t align the tap detent spring/ball with the transfer port on removing the tap - don't ask me how I know that is possible!
Of course, all the above relates to Airsporters, but should work for other 'tap loaders'?
Frequent use of the cleaning pellets after every so many shots (50?) helps to keep things clean!
ASM