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Clockwise
It takes about a week.
Basically:
1.) Plug the frame with Blu-Tac
2.) Wear goggles, Marigolds and protective clothing
3.) Mix the caustic soda in a really strong solution (eg. 250g of crystals to 500ml water) in a small batch (only enough to fill the tube) and pour it in
4.) Leave it to fizz for ages and then drain and re-fill with another batch
5.) Repeat ad nauseum (it took me about a week)
Alternatively, take it to Armourtex and they'll get it out for £35. Either method will mess up your paint.