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I just cleaned behind the plastic side covers on my 2010 RKC. I used simple green and a baby bottle brush. I left the fuse box cover on the bike while cleaning. There were no problems. I used a gentle spray from a garden hose to rinse everything off and took it for a ride immediately after the cleaning so that it would dry out quickly.
I have discovered the electrical relays on my bike are a sealed type from the factory. Water can't get into the internal parts. I didn't take any special precautions on the right side.
I use Goop hand cleaner (no pumice or abrasive) on almost everything. It will lift greasy grime easily after rubbing it in, then wipe it off, follow with a little water to rinse and you don't need to be concerned what it gets on. Use a tooth brush were needed. I've used it to get oil out of jeans an it works pretty well there too.