best way to remove engine sludge

{"cid":"91223851","title":"Multi Functional Engine Bay Oil Cleaner Easy To Use Complete Cleaning Protection","imgUrl":"https:\/\/img.chinax.com\/nimg\/52\/81\/625b0860dc151e6bf2c1d4779fdc-200x200-1.jpg","attrs":{"Price":"USD 0.50 - 3.00 \/ piece","Brand Name":"Biaobang","Model Number":"VF10036","Minimum Order Quantity":"50 pieces","Delivery Time":"2-7 work days","Certification":"ISO9001\u3001REACH\u3001IATF16949\u3001ISO14001\u3001ISO45001","Place of Origin":"Guangzhou, China","Payment Terms":"L\/C,T\/T,Western Union,MoneyGram","Supply Ability":"100000 pieces per month","Packaging Details":"24 bottles per carton","Brand":"Biaobang","Product name":"Multi-Functional Dynamic Cleaner","Type":"Cleaner & Wash","Volume":"300ml","Single weight":"300g \/ 10.58 oz","OEM\/ODM":"Support","Carton Size":"340*230*215(mm)"}}

{"cid":"91191992","title":"Engine Car Engine Cleaning Machine Carbon Build Up Removal 4.5 KW Power Supply","imgUrl":"https:\/\/img.chinax.com\/nimg\/ac\/84\/8971e3fce9d111800e5d3fb1e97f-200x200-1.jpg","attrs":{"Price":"Negotiate","Brand Name":"Zeayeto","Model Number":"HO-1500","Minimum Order Quantity":"1 Set","Delivery Time":"15 Workdays","Certification":"CE FCC","Place of Origin":"China","Payment Terms":"T\/T L\/C Paypal","Supply Ability":"400 Sets per month","Packaging Details":"Wooden Packaging","Product name":"Hydrogen carbon cleaner","Application":"cleaning carbon for diesel petrol engine","Weight":"120kg","Material":"AL","Warranty":"1year","Color":"Blue"}}