Delta Ara faucet descaling soaking tray

Attach to the faucet with rubber band during soaking.

I have used with regular vinegar and had good results.

This was designed for these faucets: 

Delta Faucet Ara Single Hole Bathroom Faucet Brushed Nickel, Single Handle Bathroom Faucet, Metal Drain Assembly, Stainless 567LF-SSMPU

Delta Faucet Ara Wall Mount Faucet, Bathroom Faucet Brushed Nickel, Wall Mount Bathroom Faucet 3 Hole, Widespread Bathroom Faucet, Stainless T3567LF-SSWL

I am sure it is usable with other similar fixtures.