When I bought my HV6, many years ago, I just cleaned off the external grease and have used it ever since, with out any problems.
My motto tends to be "if it broke, don't fix it,"
Unless it needs fixing in some way, and you are familiar with exactly how it is assembled and adjusted, it is probably better left alone..
Stripping needlessly could means that some part gets lost or damaged or a factory set adjustment cannot be repeated with the same accuracy.
And, YES, I have spent time crawling around looking for some part that I have not seen before, in the hope that I can work out how to put it all back together!
Howard