You can do but, personally, I find the proper reducer is always best.
As for cleaning it, I take the crown off, pull the trigger so the needle is in and blow it through, run it under the tap, blow it through etc... until clean. takes less than a minute to do.
If using solvent based paint instead of water based then I use thinners.
Some very small pipe cleaner like brushes can also be useful.
Hope that helps you a bit.
Martin
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