should i throw this away * dendrobium*

[frostedeyes]

i have this dendro plant that is acting really weird. well its my fault actually due to ignorace coz i just left it but after months pass the leaves starts to appear some ionno disease or rash! what should i do? anyway. note. there are healthy growths and new shoots as well. it has been like this after it fell off but it continues to grow so i guess its not a viral. but is there something i need to do more to be able to remove all these pesky rings! anyway theres a bird poop on one of its leaves! i tried using fungicide - and im going to try a diffrent brand!

*note first pic theres a small poop on its leaves (from birds)