Descale and regrease the flow control valve with silicone?
On the handle, what about surfing wax? Might look a bit like someone's spunked on your shower but meant to be quite adhesive I think.
Thinking anti-slip tape might be a good and removable alternative?
anti-slip tape
Is that like skateboard grip tape? Depends how adhesive it is, I tried to use some on TT bars and couldn't get it t stay put. Was probably using cheap stuff though.
@Howard started
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Descale and regrease the flow control valve with silicone?
On the handle, what about surfing wax? Might look a bit like someone's spunked on your shower but meant to be quite adhesive I think.