The six month guideline is only a general rule for a final varnish. It all depends on how the paint was applied and the sort of medium used, especially if alkyds were involved. A retouch varnish could be safely used in the meantime.
There's a brand of lint-free synthetic rags made by Scott that you can usually find in hardware stores that works well, or any other microfiber rag. I typically start with a dry synthetic bush, followed with a rag with just a tiny amount of spirits rubbed into it.
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