Here are some cleaning techniques that I use and they help a lot when it comes time for deep-cleaning.
Toilet: First I use a couple disinfectant wipes and wipe down the entire toilet, from the base to the very top. Then I take Windex (yes I know it's for window's but it works very well) and spray the whole toilet down and take paper towels and clean the Windex off from the base to to the top. ALWAYS remember to clean the base. It can get very disgusting. For the toilet bowl I use bleach.
Sink/Countertop: For the sink I use an SOS scrubbing pad because they usually get all the gunk off! But on some counter tops you can't use them, so be super cautious! Scrub it with one of those then turn the hot water on and rinse the sink out! For the counter top I take Windex and spray the counter including the faucet then get a little scrub brush and scrub the counter down. Then I get disinfectant wipes and wipe down the counter and the faucet.
Bathtub/Shower: For the shower and tub I get the sprayer and spray down the walls and tub off. Then I get Windex and spray everything down then wipe down everything with disinfectant wipes.
Extra Tip: After I get everything clean, I take a cloth and pour some fabuloso and hot water on it then do a quick once over everything and trust me it will smell so good! It adds a pop of freshness to the whole bathroom.