WD-40 Specialist Penetrant with Smart Straw, Penetrant for Metal, Rubber and Plastic Threads, Locks and Nuts, Industrial Strength Fast-Acting Formula, 11 Oz.

Customers find this penetrating fluid effective, with one mentioning it worked wonders on a sliding glass door track. The product receives positive feedback for its quality, ease of use in removing stuck parts, and value for money, with one customer noting it saved expensive locks. They appreciate its versatility for various household needs and its ability to break down rust and make doors and chairs stop squeaking. The spraying mechanism receives mixed reviews - while some find it handy, others report issues with it not working properly.