DavecUK Interesting I will try this next time. I replaced my original valve but that one started dripping also after not very long. Went to buy another one but they had doubled in price which seemed crazy. Instead I tried replacing the Teflon tip with ‘Sugru’. Works really well with no drips at all but only lasts around 3 months before needing re doing. Not sure if it is appropriate stuff to use but guessed it was low risk and probably no worse than Teflon!. Would love to try changing to a non compression (not sure if hat is the right terminology) but haven’t got round to researching if this would be feasible.
And as to the OP finding cleaning helped, my experience was that it did, but not for very long, so my prediction is it will need sorting again pretty soon.