Is this an indoor ivy? If so, I can pretty much guarantee you have spider mites.....it is almost impossible to grow ivy indoors without them. Keeping the humidity up pretty high where the plants are located can help but the best thing to do is to spray down the plants with water on at least a weekly basis, perhaps even more often, until you get the problem under control.

Thank you. Yes, it is an indoor ivy. I had my plants for years (living on the 7th floor) and never had problems. Within 6 months of moving (1st floor) the plants were dead.

Should I add soap to water I spray them with? Insecticide?

You don't need to unless just the water spray fails to be effective Spider mites dislike a lot of moisture or high humidity and just spraying with water is usually sufficient.

put your hand over your pot .. fingers thru the plant .... if its small enough ... invert it ... and go to town spraying it ... you can be rather harsh with it.. short of physical damage to the leaves ....

if you have more than one plant.. do them all at once ...

and better if you do it.. away from where you otherwise keep them ... the utility sink.. or even bathtub or kitchen sink ... i mean really.. if you are going to dislodge them .. may as well run them down the drain ...

and if you have other plants nearby.. treat them all ... i am wondering how you get rid of other plants .. buy new.. and still have the same problem .. whats that all about ... i would have expected that NOT to happen ....

if these are very new plants.. i would be complaining to the seller ...

ken