Reservoir (lead) cleaning

To rephrase it... you run about 15g of 100LL per 200g.  Or ~8% of the time.  Not a great amount.

The most stagnant area of the Oil system is below the pan at the bottom of the Oil Tank.

This is also the first area to be drained and is flushed by all the remainder of the Oil during the draining process.

Intentional cleaning should not be needed but many people do it at least every other Oil change.

If you run the engine up to operating temperature before the Oil Change and then drain the tank without delay, you should get out most of whatever was in there.

Drain your oil and pull the tank.  If it looks relatively clean then you probably will not need to do it again at the next Oil Change. (Or Two!)

If it looks bad, I see that cleaning it at every change is in your future.