The answer to 'how to maintain drain cleaning' is to regularly clean and maintain your drains to prevent clogs and keep them flowing freely. This involves using a drain snake or plunger to remove hair, soap scum, and other debris that can build up over time. You should also use a drain cleaner solution once a month to help dissolve and flush out any remaining gunk.
It's important to act quickly if you notice a slow drain, as clogs can worsen over time and lead to more serious plumbing issues. If a clog persists or you're unable to clear it yourself, it's best to call a professional plumber to inspect and clear the drain properly.