Honda CL 350 Scrambler: First start and alloy cleaner test

I've had alloy cleaner on the shelf for some time but have never had the nerve to try in in case it marks chrome or leaves the alloy with a horrible black residue . This bike with its oxidised alloy engine casings and cylinders seemed to offer a low risk opportunity to see what the stuff can do.
If any of you have used this stuff before and see that I'm doing it all wrong-don't be afraid to point the errors of my ways -I'll maybe be able to do it better next time.
The carbs also have been rebuilt and with some initial wiring repairs completed we have a spark up and maybe have a chance to see if this little bike will run. It's been laid up for a generation and the exhaust is shot to bits but this might tell me if we need to take a step back and dig deeper, or carry on with the recommission of the bike.
List of bikes on next shipment, due in April 2022. I can't possibly recommission or restore 18 bikes myself so if anything catches your interest as a project Email me on [e-mail]
'74 Honda CB 750. I might keep it.
72 CB 500-4. Gorgeous low miles bike.
'78 Suzuki gs 550.Super clean and original low miles bike.
2 x Honda CL 450. REALLY paid up for these so can't do as a project.
2 x BMW r90/6..a 74 and a '76. Both teens of 000 miles
2 x Kawasaki Kz 650. 1 project bike. 31000 miles and very clean
'79 CX 500 project bike. crazy low miles...ie 5,000
Low miles '79 CB650 project bike. 15000 miles
'74 Suzuki GT 185. Easy project
Yamaha XT 200 project bike.
2 x '78/9 Suzuki gs750. 1 project bike
3 x Honda CL 350. Maybe a project bike there
All the above are bought as non runners. Any I sell as projects will be sold thus.