My advice would be if you want to use friction, stick with the mittens. You can control the speed and pressure a lot more. There also relativley inexpensive so if they start to get a bit gunky and minging you can chuck them away and start afresh with a new one.
Btw, if anyone is actually able to get smooth results for two weeks with shaving or friction (without the use of other products), I DEFINATLEY envy you.
Regards,
Benji
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-Chasing the dream