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That product actually describes itself as 'non-abrasive' so perhaps test it on a less critical area, under the BB shell for example.
I doubt there will be any chemicals in a Meguiar's polish that will react badly with your paint.I was told that polishing could damage the clear coat of the original paintwork
That's precisely how most proper car polish works. It finely scratches through dull flattened clearcoat to reveal a pristine layer beneath. Different grades of polish will have more or less aggressive 'cutting' power. It's very easy to apply too much pressure or use too coarse a polish and burn through the clearcoat to the paint, particularly on non-flat surfaces such as bicycle frame tubes.
I'm looking get my Colnago in Saronni lookin new.
I was told that polishing could damage the clear coat of the original paintwork and it's dangerous putting chemicals to paint. (Paint is in good condition as is)
I purchased Meguiars Deep Cyrstal Cleaner and am unsure if I should use.
advice would help. Thanks