Use a shop vac to get the fluids out, then wipe with rag. Use Permatex head gasket remover to get the larger chunks of the HG off (great stuff). Then use a 3m roloc wheel (what I use) to make the surface sparkling clean (if you never used this wheel before, youtube it on how to use it properly because it does take material off the block). Then you will also need to clean out your head bolt holes (very important). What I do is fill the head bolt hole with brake cleaner, let it sit for like a minute, then blow it out with compressed air (hold rag around hole when doing so, because the brake cleaner will shoot out). You can also take an old head bolt, wipe it clean, and chase the threads with it. Very important, the head bolt holes must be completely dry when new bolts go in. If you have any fluid on the bottom, it can crack your block.
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