0000 will not fully remove calcium. You need a chemical to soften it as it BONDS to the glass.

Cut CLR 50 50 with water, and mist the calcium. Wait one minute, wipe with rag. Let dry.

If it worked, great. If not, use 50 50 and steel wool (000 at MOST, 0000 preferred. 00000 wont do anything.

Evaluate again (rinse well, preferably with distilled or not calciumy water.

Let dry. Move to straight CLR, 3 minute dwell and 0000 wool.