Trust me, you want to close clean, so keep at it. Here's why. I bough a foreclosure that overwintered with algae and it converted the cya to ammonia, making it ridiculously difficult to recover. The stench of sulphur and frog population was unbelievable. There are still tannin stains on the vinyl in one corner despite the seasons of chlorine and sun. Etc. you really will not regret the energy you spend now, and it will be cheaper and faster to recover now.
So, all you really need to know is this: you are in a "race" against algae. It can speed ahead and grow every time you allow the chlorine level to drop BELOW the recommended shock/slam level for your cya.
So if pool calculator tells you your shock level is 12, and you're going to be away for a few hours, dose the chlorine up a bit, eg. To 16, and see how long it takes to get back to say, 11. Normally, the time between dosing expands. Any time the FC drops below your shock value, bring it back up right away. SLAM means shock and MAINTAIN...and you're only "maintaining" in fact when you're at or slightly above shock value.
So any time you drop below the shock value, you're letting the algae grow faster than you're killing it. You will be able to tell that most of the algae is dead when your ccs are .5 or less and you're not losing more than 1 ppm overnight (eg when there's no sun to consume the chlorine.) You will also notice the color changing...from green to turquoise to blue...and over time, the dead, whitish, milky tone of dead algae will be filtered out and your water will start to look "clear."
The clearing part can take several days depending on your filter type. Eg. Sand is slower than DE.
Hope that helps and hope that once you're done you never have to "slam" against green again
You will go into next season properly armed and ready to enjoy your new, trouble-free pool
cheers to that!