I don't even think you'll have to loosen the strings. I've applied it with my fingers to the strings and fretboard of a strung guitar, then wiped it off as previously mentioned. Takes a little more work that way, because you have to work the wiping rag in between the strings and fretboard, but it's not hard to do.
"A cheerful heart is good medicine."
hiya
will try out 2day ...
will let ya all know wat goes
thanx !