The 1:2000 for primary and 1:20000 for secondary gives a very dark background .
Do you know the original concentration of each of your antibodies? Also, do you still see your band of interest (just with background) or is it just all dark?
It is likely that you can just decrease the amount of primary antibody and get better results (1:10000 at least if it is really dark now). Also how did you block your membrane?
What is your datasheet says? follow that first, and change accordingly if required later. (always with a positive control!)
We use a primary antibody dilution of 1:5000 and secondary of 1:15000 and it works great. The dark background is most likely due to insufficient washes and/or blocking. You can use upto 0.1% Tween in your blocking and wash buffers, and give sufficient washes. It should ideally give a clean blot if the lysate preparation is good.
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