Never fails 4 me . fill the seatpost tube with boilng water then add the caustic
But b carefull as it will b volatile
Leave 4 a day the swill out with boiling water . Refill and repeat till gone
takes bollox 2 use boiling water on caustic but it works
I'm mad so it helps a little
garage is under the bathroom
was well in the good books when i did it
Misses was a bit upset by the smell etc
ask dordy his on his GT was hammered 2 the bottom and I got the lot out