Speedmaster "Washed" Dials

Over the years, I've seen people talk about "washed" dials--specifically, dials without any lume. I've seen some claims that this was done by Omega when a watch was previously sent in for service. I've owned two 321 Speedmaster Pros (105.012-66HF and a 145.012-67) with washed dials and the dials were perfect in every respect, but had no lume.

Does anyone know any more about this practice? Were dials actually submerged in water and "washed" of the lume? or did they just have the lume scraped off?

I have a dial with bits of old lume that would benefit if the remaining lume was removed, but want to learn more about the practice before considering attempting it.

Here is an example:

I was preparing to get roasted for even considering this😅, but the knowledge is valuable either way.

Here is another example. My first Pre-moon speedy, a 145.012-67:

I totally agree. In my book clean presentable original lume is king, but once it's crumbling it is as follows:

Crumbling < washed < relume

However, not every watch is worth spending hundred of dollars and time reluming. I know the general feedback is not to mess with dials. Washing most other dials is a recipe for disaster. But it seems to not always be the case with these.

I've been building my reluming skills on the side and would love to give it go once I've built up enough confidence. Evidently, all the popular relumers have practiced and refined their skills with trial and error. I'd just prefer my errors to be more calculated.