- a piece of glass taken from the panel with no other work done upon it
- in the middle, a piece of glass soaked in plain water overnight and scrubbed
- and on the right, a piece of glass further scrubbed with soap.
These show no visible paint loss. So the decision is to soak the glass overnight in plain water and scrub with a nylon brush, using soap if needed.
The previous entries in this series can be found at: