Garden Pests and Diseases: Clivia problems, 2 by Midi

Midi wrote:
Does anyone know what is wrong with my mom's clivia? It has some brown spots on its leaves. I have done a mistake with this plant and washed it with soap one time because we have had thrips problem here. We have changed the pot for this plant also because the old one was broken (it was a pot with a water tank) and the all soil were under the water and some roots had rot.

I dont know is the problem thrips, soap or the rot that was on the roots? Clivia makes a new healthy leaf and looks happy, but those brown spots on the older leaves are ugly and I'm worried.

Thank you for any help!