If it's possible to destroy and burn the affected plants, that's what I would do. Dodder is very aggressive and not to be fooled around with. Its seeds can persist in the soil for as long as 20 years, so be very careful with the leftover soil. Here is a good link:

Here is a link that might be useful: Dodder at the Purdue website

Keep it pulled. Remove it as soon as you see an emergent tendril. No sense in waiting for it to take over your plants. Your options for what you can use in the greenhouse are extremely limited. Some problems simply take plain old fashioned elbow grease.

You may want to consider putting down a weed barrier as flooring of your greenhouse, once you get all of the plants pulled and removed.