Have used one for years in my power equipment engines. Like Wayne said, I first use some carb cleaner to remove the oil residue, blow it dry and then use the plug cleaner. After I am done, another quick blast with the air hose to remove any remaining grit and your good to go. I have been using the same one that I bought in the early 80's with no issues.
Same as Dave here. I bought it in 57 when I had a station in California with 3 other CHiPS. I was the 1st transfered to another area so I was only in the station about 2 years. Mine is a Champion, Champion spark plug had them built and sold them. In all these years the only maintenance I've done to this one is regularly change out the sand.. You would be shocked to see the crap that comes out of those plugs. Like the others, lawn mower, weed eater, edger, snow blower and of course the go karts is all it is used for now.
The key is clean the oil and residue off the plug, and after running the sand blast on it, to air hose the inside of the open end of the plug.