NO photo here, so we have to do our best guessing. The "blue part" sounds as if it is the plastic molded part the washer hoses actually screw on to. Now, is the leak where the hose actually screws/connects to this "blue part"? IF SO--you may need a new washer, or even a washer in the hose coupling to stop this. Don't use a cheap plastic washer either, find some good rubber washers with screens built into them for this. IF this leak is behing this blue plastic piece, it may be cracked and have to be replaced. These are available from appliance repair centers, and is a DIY job.
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