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If the mirror of your dob is clean, then the most likely cause is internal reflections within the eyepieces. Good quality eyepieces are marked with "Fully Multi-Coated". They will also have the edges of the lenses blackened. All this goes to reducing these reflections. If they only state "fully coated" or make no mention of coatings, then this is the most likely cause.
There are three solutions:
1, Use a Neutral Density filter to reduce the amount of light from bright objects
2, Invest in better quality eyepieces. These are not necessarily expensive. Andrews Communications has a range of GSO plossl eyepieces that would do the job admirably until you are prepared to spend a little more.
3, You might also like to make a mask for the dob, reducing the apeture of your scope, there by increasing its focal ratio and reducing the glare on bright objects. It will also improve the image quality with the increased focal ratio. Make the mask out of waxed cardboard that you can find at fruit and vege shops as these are water resistant- good for when the night begins to dew up. You can start by making the apeture 4".
Mental.
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