I'm not sure how much of a difference it makes. I clean my chains pretty well prior to first wax, going through ~3 cycles in mineral spirits, but not nearly to the lengths that some go. I've been adding wax to the same pot for nearly 10k miles now and I've had no issues. Sometimes the wax lasts 50 miles (wet gravel race), sometimes it lasts 500 miles (road bike only ridden on nice days).
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