how to remove old silicone sealant

{"cid":"91219429","title":"white Color Neutral Cure Silicone Sealant 300ml For Glazing All Kinds Window","imgUrl":"https:\/\/img.chinax.com\/nimg\/c8\/f1\/5e139fca4a8d3372bb5ef4e4a0b6-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"KINGDELI","Model Number":"HY723","Minimum Order Quantity":"720","Delivery Time":"7-25 days","Certification":"ISO9001:2008","Place of Origin":"CHINA","Payment Terms":"L\/C, T\/T","Supply Ability":"66000tons annually","Packaging Details":"plastic cartridge, aluminum foil","Application":"Door And Window","Tack-Free Time":"20 to 30 minutes","Color":"white","Type":"Flame Retardant silicone sealant","Main Raw Material":"Silicone","Package":"300ml","Component":"One Component","Shelf life":"12 Months"}}

{"cid":"91185578","title":"Low VOC Waterproof Silicone Sealant 300ml Tinplate MSDS For Aquarium Production","imgUrl":"https:\/\/img.chinax.com\/nimg\/29\/c3\/3e9ec93f562caa9707bd8bca582b-200x200-1.jpg","attrs":{"Price":"USD1.0-3.5 per can","Brand Name":"PLYFIT","Model Number":"HY-732","Minimum Order Quantity":"6000pcs","Delivery Time":"20-25 days","Certification":"ISO9001:2000, MSDS","Place of Origin":"Guangdong,China","Supply Ability":"800000cans per month","Packaging Details":"300ml, 24pcs\/carton, 2000cartons\/48000pcs for a 20ft container","Production name":"Silicone sealant","application range":"Sealing and bonding","color":"clear\/grey \/white\/black","Usage":"used in the aquarium production and for the purposes of adhesion in glass construction.","leadtime":"20-25days","feature":"Excellent Sealing","Warrenty time":"one year","Main raw material":"Silicone"}}