Slippery clutch but not consistent or on pulling away?!

Morning all, I recently topped up my gearbox oil and whilst it has improved changes ect I now
Seem to have a slight slip in mid range revs nothing like a
Clutch going (nor should it as I replaced it 3000 miles ago) I'm thinking a
Possible seal leak? Is it advisable for
Me to just open up my timing adjustment hole and spray some clutch and brake cleaner and leave it Over night and pray ? And by leave it I mean leave it open to evaporate!

id say leak as i have had mine do it twice!
cound be engine oil or gearbox oil. needs box off and check or just replace rear main (possible rear flange seal) and input shaft.

Ok it's definitely box
Oil! Noticed a pool this morning! So that'll be the box seals! Any ideas on how much it'll cost me'? I just haven't got the time to do it right now as I work in Essex and live in Hampshire!

well i should imagine if its that bad you will need a full clutch change and rear seal, you need to take gearbox/clutch/flywheel to get to it anyway so i should imagine it will be approx the same as a new clutch plus tenner for the seal and an extra hour labour maybe

So not really short of like 350/400 lol niuiice!!!!