I know how to clean a garage. I transformed a garage into a studio once already so I have some tips.
Problem is, I'm convinced that these guys (or should I say gals) are everywhere in the garage, lurking. Haven't found one yet but the only way I can be brave enough to stick my arm in dark, cobweb covered, possibly poisonous nooks and crannies is to wear my specially designed garage decluttering uniform:
Tip #1 - Bright orange rubber gloves and bright red rubber boots. I usually opt for paint splattered t-shirts and surgical scrubs for the rest but the gloves and boots are required.
Tip #2 - The other spider deterrent I've invented is to swear a lot. And use a a British accent. While swearing. Scares the @$%# out of creepy crawlies and makes me feel badass.
Tip #3 - If you come across something and you have to ask yourself "What the heck is this?" chances are, you don't need it. Straight to the donate or trash pile.
This "uniform/accent swearing/throw it out" combo gets the job done!
One corner down, seven more to go. Or something like that.
I continue to pick very messy hobbies that require garages. Hmmmm...