I was agreeing with what SST stated. 'Chrome polish is an abrasive.'
The other suprising element is that even if it were not, the 'dirt', that is removed by it's action
becomes an abrasive by being trapped on the cloth during the cleaning operation.
About the only thing that I would use, turning the 'cloth', frequently when signs of 'shading', appear,
is 'NEVER-DULL', wadding polish. (chemical & mechanical action)
Regards, J T