For a change, I'm posting an answer to hopefully pre emptively help others and not a question
In addition to fitting the new engine to my 12, I'm also tidying up what I can firewall forward and the very dirty and stained Heater Shroud was high on the list. I researched stainless steel clean up options and came up with recommendations for Autoglym Metai Polish. The transformation in the pics took around 90 minutes and was achieved with just the polish, a soft cloth to apply the polish and then plenty of elbow work to rub it into the stains until they broke up and came out and then a microfibre cloth to finish off.
To say I'm pleased with the results is an understatement
In addition to fitting the new engine to my 12, I'm also tidying up what I can firewall forward and the very dirty and stained Heater Shroud was high on the list. I researched stainless steel clean up options and came up with recommendations for Autoglym Metai Polish. The transformation in the pics took around 90 minutes and was achieved with just the polish, a soft cloth to apply the polish and then plenty of elbow work to rub it into the stains until they broke up and came out and then a microfibre cloth to finish off.
To say I'm pleased with the results is an understatement