Tektro hydraulic help!!

I am hoping someone may be able to help me, I have a whyte 801 with tektro hydraulic brakes, last summer after not having used for a while the brakes were squealing and just not as good as they used to be, I tried to clean down as best as could with brake cleaner and bled the system with fresh fluid however I feel this could have also been better,
So I have now bought new pads and have stripped the wheels off and throughly cleaned the discs to remove any possible contamination, I have removed all the old fluid and have bled through new, however before putting in the new pads I have noticed that the pistons on the calipers don't move equally, (one side more than other unless held back, they also seem a little stiff, can anyone advise how best to sort my current calipers and achieve a strong bleed
So I have now bought new pads and have stripped the wheels off and throughly cleaned the discs to remove any possible contamination, I have removed all the old fluid and have bled through new, however before putting in the new pads I have noticed that the pistons on the calipers don't move equally, (one side more than other unless held back, they also seem a little stiff, can anyone advise how best to sort my current calipers and achieve a strong bleed
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You can try and free up the pistons by over-extending them (gently squeeze the brake lever with no pads in the caliper, taking care not to pop them out of the seals) and then clean around the outside using a cotton bud. Again search the web for how-to videos.
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