Gary tackles two home improvement conundrums. First, a caller shares a garage floor with a stubborn acid stain, and Gary offers DIY solutions using baking soda and vinegar. Next, a homeowner with a whole house fan complains about the loud noise, and Gary explains that it's due to the fan's speed and design. He also discusses the importance of inspecting the outside of a house to identify potential water issues, and shares tips on repairing corrosive salt damage on garage floors.