Need help identifying pest! Please!

Hello,
I need some help identifying what's wrong with my poor plant and solution to the problem. I'd be grateful if anyone here could help m with this.
My plant was doing very well till a few months ago when it started t seem 'droopier' than normal. Recently, some of its leaves have begun t discolor to a very light, sickly green and falling off. I notice tha most of the droopy and sick leaves have brown/black spots on thei surfaces, as well as odd patches of a transparent substance, especiall on the veins of the leaves.
I have included pictures of the spots and transparent patches with thi post.
Does anyone know what this is, and, especially, how to get rid of it Poor Mr. Planty isn't looking so good
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starrburst

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starrburst Wrote:

Hi Starrburst.
The brown could be overwatering, sun scald or any number of things. The white on the leaves looks like powdery mildew. What is Mr Planty's name? Any other info on him? Planted indoors or outdoors?
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