Phalaenopsis Bellina - Brown stains on leaves

[Roma Oli]

Hello,

This morning I noticed brown stains on the leaves. I watered the plant on Saturday - my guess is that some water stayed on the leaves for too long and might have caused a bacterial infection. Do you know if that is the case?

I patted the leaves with hydrogen peroxide this morning, but now wondering if it is effective anymore since it was open for a while. I read that if it is a bacterial infection, I need to remove the tissue urgently which means removing the two top leaves (see picture attached), which is probably very stressful for the orchid.

Please advise.

Thank you so much in advance.