If it is important to open the blocks for cleaning then it is DOUBLY important to have them ship with spare O rings.
I won't open my block for that very reason. A year on cooling my system I'm sure the O ring won't be up to much however good the quality is it would have degraded somewhat in that time and opening the block is only asking for trouble. As I have no spare - high preasure water from the tap is about as much cleaning as the block gets.
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1800+ @ 2247 (214x10.5) - STABLE, 512MB PC3700 TwinX Cosair RAM, NF7-S v2.0, GeForce3 Ti200
Parallel BIM, 120.1 Thermochill, Eheim 1048, Maze 3, Maze4 GPU, "Z" chipset, 1/2" tubing, PC-70: 5x120mm & 9x80mm fans.
Internet Server & second machine (folding 24/7): 512MB DDR RAM, XP2000+
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