Scum around bath and basin

[Bollod]

I live in a soft water area, the kettle for instance is as new after many years, no scale.
However the wash hand basin and bath always have a scum left around them after draining like you expect in a hard water area. All types of soap, same result.
I have a combi boiler, an Ideal, previous boiler was a Worcester.
It has been suggested that it is because of the way the water to water exchanger works in a combi which somehow changes the way the water reacts with the soap.

Bit of a strange one but has anyone have any knowledge of this please?

 

[Rickster123]

Maybe you're just grubbier these days?

 

[king of pipes]

New one on me bud , just cut back on how much soap and shampoo you use hand washing a pea size amount of liquid soap , shampoo , shower gel a teaspoon amount , shaving not alot you can do except grow a beard sama: