If corolla still squaks in suspension after spraying front end. Dont forget to spray some silicon up the spring ( lower strut housing and on top of strut ( lift hood ) , may be because you have high mileage say 100,000 miles+ .
Then you may need to replace some frt end parts, jiggle them to see if their loose ( bushing may be gone )
If your not qulified to take on the task find & stick with an honest mechanic.
If you find the job to expensive, & depending on overall condition of the vehcle you may want to trade your Corolla for a new one.